Originally Posted by willwren
A fan with a dead spot? Not possible. If a winding went out, it'* a goner.
Sorry, but I have to disagree here; a dead spot doesn't necessarily mean a broken winding. Our '96 Trans Sport blower motor would simply not run until I popped the hood and tapped it with a stick, at which point it would start spinning just fine, until the next time we shut down the van. Finally got around to pulling the thing out (on a '96 Trans Sport that is _not_ fun), and blasted it thoroughly clean with carb cleaner by squirting the brushes and armature through the cooling holes. I also added a drop of oil to the bearings, and it ran fine for about 18 months after that. When the symptoms returned (wouldn't start by itself until I either tapped it with a stick or drove over some bumpy road), it had another cleaning and it'* back to normal again.
So basically the "dead spot" may be just dirt. It'* easy to pull the blower on a Bonneville so I would just yank it and blast some cleaner in there.
BTW, your problem _is_ the blower motor, if turning corners will affect its operation, because the centrifugal force of cornering is shifting the squirrel-cage fan on its shaft. I think your blower is probably worn out (shaft tolerances are probably shot), but with a cleaning and a little oil you may get it working again and save yourself some bucks.